Probing the ultrafast dynamics of excitons in single semiconducting carbon nanotubes

Excitonic states govern the optical spectra of low-dimensional semiconductor nanomaterials and their dynamics are key for a wide range of applications, such as in solar energy harvesting and lighting. Semiconducting single-walled carbon nanotubes emerged as particularly rich model systems for one-di...

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Bibliographic Details
Published in:Nature communications 2022-10, Vol.13 (1), p.6290-8, Article 6290
Main Authors: Birkmeier, Konrad, Hertel, Tobias, Hartschuh, Achim
Format: Article
Language:English
Subjects:
639/766/119/1000
639/766/930/527
639/925/357/73
Carbon
Decay
Dynamics
Energy harvesting
Excitons
Humanities and Social Sciences
Luminescence
multidisciplinary
Nanomaterials
Nanotechnology
Nanotubes
Photoluminescence
Photons
Science
Science (multidisciplinary)
Sensitivity
Single wall carbon nanotubes
Solar energy
Spectroscopy
Spectrum analysis
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Summary:Excitonic states govern the optical spectra of low-dimensional semiconductor nanomaterials and their dynamics are key for a wide range of applications, such as in solar energy harvesting and lighting. Semiconducting single-walled carbon nanotubes emerged as particularly rich model systems for one-dimensional nanomaterials and as such have been investigated intensively in the past. The exciton decay dynamics in nanotubes has been studied mainly by transient absorption and time-resolved photoluminescence spectroscopy. Since different transitions are monitored with these two techniques, developing a comprehensive model to reconcile different data sets, however, turned out to be a challenge and remarkably, a uniform description seems to remain elusive. In this work, we investigate the exciton decay dynamics in single carbon nanotubes using transient interferometric scattering and time-resolved photoluminescence microscopy with few-exciton detection sensitivity and formulate a unified microscopic model by combining unimolecular exciton decay and ultrafast exciton-exciton annihilation on a time-scale down to 200 fs. Excitonic states govern the optical response of low-dimensional nanomaterials and are key for a wide range of applications. Here, the authors investigate the exciton decay dynamics in single carbon nanotubes with few-exciton detection sensitivity.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-022-33941-2